Reg, what about Rho = SQRT(P-/P+) and SWR=(1+Rho)/(1-Rho)?
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Cec, That's a calculation, merely arithmetic, not a measurement.

It applies only to a long line lossless line which does not exist but
Zo must be 50 ohms. And nobody has the foggiest idea where max-volts
and min-volts are located. And so the calculated information is
useless except for trolling on newsgroups. ;o)
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Reg.